CONDENSED BALANCE SHEETS - USD ($)	Mar. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 1,065,364	$ 2,248,466
Trade receivables, less allowance of $70,000 in 2016 and $122,000 in 2015	2,221,256	2,165,194
Inventories	2,254,034	2,119,805
Prepaid expenses and other assets	182,122	85,648
Income taxes receivable	242,131	102,778
Total current assets	5,964,907	6,721,891
PROPERTY, PLANT, AND EQUIPMENT, at cost:
Land and building	6,366,352	6,391,555
Machinery and equipment	4,427,722	4,275,910
Office equipment	943,511	933,596
Vehicles	272,141	272,141
Construction in progress	3,103,129	2,491,432
Gross property, plant, and equipment, at cost	15,112,855	14,364,634
Less accumulated depreciation	(6,546,593)	(6,407,304)
Net property, plant, and equipment, at cost	8,566,262	7,957,330
INTANGIBLE ASSETS, less accumulated amortization of $130,004 in 2016 and $123,957 in 2015	344,291	336,096
Total assets	14,875,460	15,015,317
CURRENT LIABILITIES:
Accounts payable - Trade	591,050	420,245
Accounts payable - Construction	96,166	333,339
Accrued compensation	397,033	350,518
Other accrued liabilities	94,561	31,000
Total current liabilities	1,178,810	1,135,102
DEFERRED INCOME TAXES	385,000	385,000
Total liabilities	1,563,810	1,520,102
STOCKHOLDERS' EQUITY:
Common stock, par value $.10 per share; authorized 4,750,000 shares; issued and outstanding 2,018,753 shares in 2016 and 2,018,253 in 2015	201,875	201,825
Additional paid-in capital	2,712,247	2,703,050
Retained earnings	10,397,528	10,590,340
Total stockholders' equity	13,311,650	13,495,215
Total liabilities and stockholders' equity	$ 14,875,460	$ 15,015,317